Crane-hook locking attachment.



A. JOHNSON. CRANE HOOK LOCKING ATTACHMENT.

APPLICATION FILED MAY 17, 1911.

Patented Dec. 10, 1912.

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COLUMBIA PLAHouRAPu CO.,WASH|NOTON. D. c.

outrun sm'rns PATENT OFFICE.

AUGUST JOHNSON, OF SOUTH CHICAGO, ILLINOIS.

CRANE-HOOK LOCKING ATTACHMENT.

ingdevice therefor whereby objects sus-.

pended from said hook will be prevented from accidental disengagement therefrom.

A further object of my invention is to provide a locking device for a crane-hook which when in looking position will reinforce and strengthen the hook.

Other objects will appear hereinafter.

lVith these objects in view' my invention consists in the novel construction and arrangement of parts all as will be hereinafter fully described and more particularly pointed out in the appended claim.

My invention will be best understood by reference to the accompanying drawing forming a part of this specification, and in which,

Figure 1 is a side elevation of a cranehook embodying my invention, Fig. 2 is a top plan view of the locking device and a transverse section of the hook to which it is attached, Fig. 3 is a detail section taken on line a;w of Fig. 2, Fig. 4 is a view showing a modified form of locking device, and Fig. 5 is a detail top plan view showing a section of said modified form.

The preferred form of construction of my invention as illustrated in the accompanymg drawing com rises an ordinary cranehook 1 suspended y the usual cord or cable 2. The locking device which is designed to retain anything suspended on the hook 1 comprises a reduced medial portion 3 formed on the hook 1 on which is rotatably mounted a ring 4 having two contiguousradial ends 5 which are perforated to receive a pivotal pin 6 by means of which the vertically swinging arm 6 is connected to the ring 4. The arm 6 being mounted to swing vertically on the ring 4 and the latter to rot-ate about the body of the hook permits said arm to assume the dotted line position as shown in Fig. 1 when not in use. In order to connect the free end of the arm 6 with the point 7 of the hook 1 a reciprocatory springpressed pin 8 is placed in the axial bore 9 Specification of Letters Patent.

Application filed May 17, 1911.

familiar with such devices.

Patented Dec. 10, 1912.

Serial N 0. 627,704.

provided therefor in the arm 6. The in 8 is so fitted in the bore 9 as to move reely therein which movement is accomplished by a finger-piece 10 and the end of the hook is turned outwardly to prevent swinging of arm 6. This finger-piece is provided with a reduced threaded end which is screwed into the pin 8 so as to roject radially therefrom as shown in detail in Fig. 3. The helical spring interposed between the inner end of the pin 8 and the bottom of the bore 9 serves to maintain said pin in the normal position as shown in the several views, said spring being of the compression type. A longi tudinal slot 11 is formed in the wall of the arm 6 to provide clearance for the reciprocation of the finger-piece l0 and to prevent revolution thereof.

The operation for locking the hook is as follows: Assuming the locking device to be in the dotted line position as shown in Fig. 1, then it is necessary after the hook has been engaged with the object suspended therefrom to rotate the ring 4 a half a revolution whereby a hook 12 of the oscillatory arm 6 is engaged with the point 7 of the hook 1, it being obvious that the finger-piece 10 must be moved sufficiently to permit of this engagement. In this locking position the hook 12 reinforces the point 7 of the hook I as will be readily understood by those It will be observed that the arm 6 is provided with a bifurcated end which embraces the ends 5 of the ring 4 through which the pivotal pin 6 is passed, this construction being obviously compact and strong.

In the modified form of locking device as shown in Figs. 1 and 5 the spring-pressed pin 8 is mounted in an arm 6 similar to the pin 8 in the arm 6 of the preferred form, the difference being that the pin 8 engages a transverse aperture 13 provided in the point of the hook 7 instead of engaging the outer surface thereof as shown in Fig. 2. The hook 12 is also of somewhat different form from the hook 12 inasmuch as a less curvature is required for embracing one-half of the hook than for a full embrace thereof.

A crane-hook locking device of the construction set forth is easily manipulated and serves the purpose for which it is designed in an eflicient manner.

l/Vhile I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. I therefore do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claim.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

The combination of a crane-hook opening upwardly and having a bill with an outwardly turned end, an arm mounted on the hook shank to swing horizontally and up wardly and provided at its free end with a hook open at one side and adapted to engage the bill of the crane-hook below the outwardly turned end, the end being so far spring catch on said arm hook adapted to engage said crane-hook bill, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. v

AUGUST J OHN SON.

Witnesses HELEN F. LILLIs, JOSHUA R. H. POTTS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, .D. G. 

